SB2025121208 - Ubuntu update for python-urllib3

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Main Vulnerability Database SB2025121208

SB2025121208 - Ubuntu update for python-urllib3

Published: December 12, 2025

Security Bulletin ID SB2025121208
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2025-66418)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to missing limits on the number of links in the decompression chain when handling gzip or zstd data in the server response. A malicious server can send a response with a large amount of links and cause high CPU load, leading to a denial of service condition. 


2) Resource exhaustion (CVE-ID: CVE-2025-66471)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the streaming API does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References